108 ジャイロによる吊橋の空力振動の制御(セミアクティブ制振)

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This paper deals with the effect of a gyroscopic damper(GD) in suppressing the wind-induced coupled flutter of a bridge deck. The equivalent inertia moment ratio μ_e is proposed, which indicates the effect of the GD. Its validity as an indication of the effectiveness in suppressing a bridge deck flutter was examined numerically with a super-long-span suspension bridge with a main span of 2500m. A wind tunnel test with a two-dimensional bridge deck model in smooth and turbulent flow was performed. It was established that the GD had a major effect in suppressing the bridge deck flutter. However, flutter speed of the bridge deck with GD in turbulent flow was decreased compared with that in smooth flow because of a large oscillation of the GD gimbal. The flutter speed in turbulent flow was increased by making damping of the GD a little higher or by increasing rotational speed of the rotor of the GD.
2002-01-11